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MPS Method for Interaction Between Solitary Waves and submerged horizontal plate

China Ocean Engineering 2020年第3期34卷 314-327页

作者： XU Yan-zhang ZHAO Wei-wen WAN De-cheng Computational Marine Hydrodynamics Lab(CMHL) State Key Laboratory of Ocean EngineeringSchool of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

The interaction between structure and wave is a typical phenomenon in naval architecture and ocean *** this paper,numerical simulation is carried out to study the interaction between a two-dimensional submerged,fixed,horizontal rigid plate and solitary wave with our in-house meshless particle CFD solver ***,the in-house CFD solver is verified by experimental results conducted at the State Key Laboratory of Coastal and Offshore Engineering,Dalian University of *** the verification,the plate is submerged under water and the solitary wave with a given amplitude is generated by a piston-type wave *** surface elevation of the wave and the pressure impacting on the plate is recorded and compared with experimental data *** predicted pressure and surface elevation agree well with the experimental *** in order to further investigate factors affecting wave-structure interaction,wave height,submerged depth and plate length are analyzed.

关键词： MPS method MLParticle-SJTU solver solitary waves submerged horizontal plate wave-plate interaction

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Hydroelastic Analysis of a Very Large Floating Structure Edged with a Pair of submerged horizontal plates

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Journal of Ocean University of China 2015年第2期14卷 228-236页

作者： MA Zhe CHENG Yong ZHAI Gangjun OU Jinping Deepwater Engineering Research Center Dalian University of Technology

This paper is concerned with the hydroelastic problem of a very large pontoon-type floating structure(VLFS) edged with a pair of submerged horizontal plates, which is a combination of perforated and non-perforated plates attached to the for-end and back-end of the VLFS. For the hydroelastic analysis, the fluid is assumed to be ideal and its motion is irrotational so that a velocity potential exists. The VLFS is modeled as an elastic plate according to the classical thin plate theory. The fluid-structure interaction problem is separated into conventional hydrodynamics and structure dynamics by using modal expansion method in the frequency-domain. It involves, firstly, the deflection of the VLFS, which is expressed by a superposition of modal functions and corresponding modal amplitudes. Then the boundary element method is used to solve the integral equations of diffraction and radiation on the body surface for the velocity potential, whereas the vibration equation is solved by the Galerkin's method for modal amplitudes, and then the deflection is obtained by the sum of multiplying modal functions with modal amplitudes. This study examines the effects of the width and location of the non-perforated horizontal plates on the hydroelastic response of the VLFS, then the performance of perforated plates is investigated to reduce the motion near the fore-end of the VLFS. Considering the advantages and disadvantages of submerged plates without and with cylindrical holes, we propose a simple anti-motion device, which is a combination of a pair of perforated and non-perforated plates attached to the for-end and back-end of the VLFS. The effectiveness of this device in reducing the deformation and bending moment of the VLFS has been confirmed, and is compared with the results in cases without and with the submerged horizontal plates by the analysis in this paper.

关键词： VLFS anti-motion device hydroelastic problems perforate horizontal plate submerged horizontal plate

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